| Naga
- The *ICLARM Quarterly
Vol.
22, No. 1 (January - March 1999)
Fishbyte
(Fisheries Section of NTAFP)
Editorial
Spreadsheets
are being increasingly used by fisheries scientists
and one of the masters of the game is Tony Pitcher
from the Fisheries Centre, UBC. The use of spreadsheets
has been promoted by the FAO/Danida Training Courses
in Fish Stock Assessment, and they are indeed
excellent for creating an understanding of the
underlying calculations. Because of the
ease of building applications in spreadsheet they
are also a very convenient tool for the experienced
user. Needless to say there is a danger associated
with them with regard to quality control. Errors
can be easily introduced and it is difficult to
verify results from such analyses. As creation
of software is becoming a more and more complex
task, we need to consider when it is best to use
spreadsheets and when distributed software. We
hope that Prof. Pitcher’s contribution will
help to stimulate this discussion.
Mr.
G. Silvestre and Dr. V. Christensen
*ICLARM
Length-Weight
Relationships of Demersal Fishes from the Gulf
of Salamanca, Colombia
L.O.
Duarte, C.B. García, N. Sandoval,
D. von Schiller, G. Melo and P. Navajas
Abstract
The
parameters a and b of the length-weight relationship
of the form W=aLb
are presented for 37 fish species, belonging to
17 families, caught during a demersal trawl survey
over the period December 1995 to March 1998 in
the Gulf of Salamanca, Colombia.
L.O.
Duarte, C.B. García, N. Sandoval, D. von
Schiller, G. Melo and P. Navajas are from the
Instituto de Investigaciones Marinas y Costeras
INVEMAR, A.1016, Santa Marta, Colombia S.
Beverton
and Holt Equations: Spreadsheet Functions and
Uncertainty
T.J.
Pitcher
Abstract
This
contribution illustrates how modern spreadsheets
aid the calculation and visualization of yield
models and how the effects of uncertainties may
be incorporated using Monte Carlo simulation.
It is argued that analogous approaches can be
implemented for other assessment models of simple
to medium complexity—justifying wider use
of spreadsheets in fisheries analysis and training.
T.J.
Pitcher is Director of the Fisheries Centre, University
of British Columbia, Vancouver, Canada.
Length-Weight
Relationship of Fishes from Yemen Waters
(Gulf of Aden and Red Sea)
H. al Sakaff
and M. Esseen
no
abstract
Occurrence
and Distribution of Fish Species off Yemen (Gulf
of Aden and Arabian Sea)
H. al Sakaff
and M. Esseen
no
abstract
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